Condenser assembly



April 1951 J. R. MAZZQLA 2,547,085

CONDENSER ASSEMBLY Filed May 1, 1948 3 Sheets-Sheet 1 l a j. 1&2.

Him? "'l'ilmi I '5 ii 'l ljic .3 47b 12 2q 5 17b 13 April 3, 1951 J. R.MAZZOLA CONDENSER ASSEMBLY 3 Sheets-Sheet 2 Filed May 1, 1948 INVENTOR.

April 1951 J. R. MAZZOLA 2,547,085

CONDENSER ASSEMBLY Filed May 1, 1948 3 Sheets-Sheet 3 A13 EC EBJNVENTOR.

Patented Apr. 3, 1951 UNITED STATES PATENT OFFICE CONDENSER ASSEMBLYJoseph R. Mazzola, Kearny, N. J., assignor to Automatic ManufacturingCorporation, Newark, N. J a corporation of New Jersey Application May 1,1948, Serial No. 24,620

3 Claims.

This invention relates to the condenser and coil assemblies of thegeneral type disclosed in the U. S. patent to Ketcham No. 2,435,630issued February 10, 1948, which assemblies are useful as so-calledintermediate frequency transformers and for certain other purposes. Insome circuits in connection with which devices of the above charactermay be used, it is necessary to provide capacity units additional tothose disclosed in the above mentioned Ketcham patent, and in certaininstances an extra terminal strip or strips may be desirable, even whenno additional capacity unit be needed.

The invention aims to satisfy special requirements of the abovecharacter, which are difficult to provide for in a practical manner inview of the space and design limitations with which such devices aresubject. Further objects and advantages of the invention will be in partobvious and in part specifically referred to in the descriptionhereinafter contained which, taken in conjunction with the accompanyingdrawings, discloses a preferred form of condenser and coil assemblyconstructed to operate in accordance with the invention; the disclosurehowever should be considered as merely illustrative of the invention inits broader aspects. In the drawings Figs. 1 and 2 are side views, takenat right angles to each other, of a condenser and coil assemblyconstructed in accordance with the invention, certain parts of theexterior housing being "cut away.

Fig. 3 is an end view taken from the bottom of Fig. l. i

Fig. 4 is a section on the line 44 of Fig. 1 looking in the direction ofthe arrows.

Fig. 5 is an exploded perspective view of the condenser assembly.

Fig. 6 is a central transverse section through the condenser assembly,the latter being shown detached.

Figs. '7 and 8 are side views of the condenser assembly shown in Fig. 6,taken at right angles to each other.

' Figs. 9 to 12 are schematic diagrams illustrating various circuitconnections to which assemblies constructed in accordance with thepresent invention are applicable.

' The assembly is shown in Figs. 1 to 4 as contained within an outerhousing i which may be of metal and clamped to a chassis or the like toserve as an electrostatic shield as set forth in the Ketcham patentabove mentioned. For present purposes the coil and core structure neednot be described in detail; in Fig. 2 I have shown two cores 2, whichmay be understood as held in position between frame pieces 3 by U-shapedclips 4 in the manner described in the Ketcham patent, the frame pieces3 extending longitudinally of the coils and cores on opposite sidesthereof, and being provided with extensions 5 (Fig. 1) which overlap andhold between them the main supporting block 6 which carries thecondenser assembly.

The construction of the condenser will be best understood by referenceto Fig. 5. As there shown the supporting block 6 is provided with cornerposts I receiving between them a pressure distributing plate 8 in suchmanner that the laminae of the condenser are clamped between opposedfaces of the members 5 and 8 by a hollow rivet e or equivalent clampingmember which passes through alined central holes in the elements of thecondenser and engages a spring washer II) which overlies the plate 8.The parts I3 and 8 will usually be of molded plastic.

The condenser assembly is shown as having three capacity units servedrespectively by the terminal strips II, l2, the terminal strips I3, I4,and the terminal strips I5, I6. In assembling the condenser the terminalstrip I6 is first inserted through a groove I! of inverted T crosssection in block 5, until its contact arm ISa lies against the innerface of block 6. It should be noted that the groove I! in general liesbetween two of the corner posts I but is displaced somewhat inwardlytoward the center of block 6; also the contact arm Ifia is laterallyofiset with respect to the terminal strip I6, to extend partially aroundthe clamping member 9 and in spaced ,relation thereto when the latter isinserted.

Then a dielectric sheet I8 of mica or the like is placed over thecontact arm Isa, this insulating sheet I8 having opposed conductingfilms I8a (Fig. 6) which may be of silver or the like, upon its oppositesurfaces. Then the terminal strip I5 is inserted in a groove IIa inblock e, which groove is similar to the groove I! and located in theopposite side wall of the block, until the contact arm I5a of terminalstrip I5 engages against the adjacent conducting film I8a, the contactarm I5a being laterally offset similarly to the complementary contactarm Ifia, but in the opposite direction so as to overlie the latter.Thus the two conducting films I 8a constitute a capacity unit served bythe terminal strips I5 and I6.

Then a dielectric sheet I9 is laid over the contact arm 15a, thisinsulating sheet carrying on its opposite surfaces opposed conductingfilms ISa. The terminal strip I2 is then inserted through 3 one of thegrooves l'lb adjacent a corner of block 6, until its contact arm 42aengages the adjacent conducting film I9a. Thus the two conducting filmsIda constitute a second capacity unit served by the terminals I2 and I5.

The terminal strip is is also inserted through another one of the slotslib adjacent another corner of block 6, until its contact arm Ma engagesthe upper surface of insulating sheet i9. It will be noted that thiscontact arm is shaped to provide oppositely displaced raised portions Mb(Fig. 5) which in effect double the thickness of the contact arm. Thisis done to balance the thickness of the laminae which lie respectivelyon the left and right hand sides of Figs. 5 and 6; as shown in Fig. 6,for example, the insulating sheets I8 and i9 bend downwardly somewhat onthe right hand side of the figure, and the raised portions 14b add extrathickness to this right hand side. I

Then a dielectric sheet 2c is placed over the contact arms 12a and Ma,said sheet having upon its opposite surfaces, opposed sets of conductingfilms 28a and 2%. The lower conducting film a engages certain raisedportions Nib of the terminal strip it, and the lower film Zeb engagesthe Contact arm i2a.

The terminal strip H is then inserted through one of the slots llbadjacent one of the corners of block 6 until its adjacent contact arm Ila engages with the top conducting film 23b. Also the terminal strip isis inserted through the groove l'lb near the remaining corner of block6, said last mentioned terminal strip having a contact arm Ilia providedwith raised portions l3!) similar to the parts l lb previouslydescribed. Thus the conducting films 2M constitute a capacity unitserved by the terminals 33 and i l, and the conducting films 20bconstitute another capacity unit served by the terminals ii and i2. Thepressure plate 8 and washer It"! may be then placed in position on topof the assembly above described, and the rivet 9 applied under pressureto hold the parts in the form shown in Figs. 6 to 8; with the pressureapplied to the contact arms.

The above type of construction accordingly results in a condenserassembly in which two rows of three terminal strips each are providedalong two opposite sides of the block 6, with the terminals l5 and i5occupying an intermediate position and the remaining terminals locatednear the respective four corners of block This leaves the central spacesbetween the two remaining sides of block 6 free to allow the base 2i(Figs. 1 and 2) of a U-shaped spring metal mounting clip to pass acrossthe end of the assembly between the two rows of terminals, said springclip having lugs 22 (Fig. l) which look releasably in complementaryrecesses in housing .i, to clamp the assembly to a chassis 23.

To accommodate the conductors leading from the coils above mentioned tothe condenser terminals, each of the frame pieces 3 is shown as providedwith lacing lugs 24 (Fig. 1) spaced along one side edge thereof andhaving spaced sets 25 and 26 (Fig. 4) of conductor receiving notches. Asshown at the left of Fig. 1, a conductor 2! leading from a coil is lacedthrough the notches 26 and through the adjacent groove ill) to theterminal strip [2. An adjacent conductor 28 is laced through the notches25 and is then received in a passageway 29 (Figs. 1 and 3) which runsalong the extension 5 of the frame piece to the adjacent groove Ila,from whence the conductor 28 runs to terminal strip 55. In theillustrated asrzoss T A T F l n. r., f

4 form of the invention the remaining side edges of the frame pieces areprovided with locking lugs 30 (Figs. 1 and 4) having a single set ofnotches 31 therein to accommodate conductors leading respectively to theterminal strips l I and I3, the terminals I4 and I6 being served in themanner above described in respect to the terminals I2 and i5respectively.

Figs. 9 to 12 illustrate various circuit connections of the coils andcapacity units which may be made with the aid of assemblies of the typeabove described, Fig. 9 showing an AM hook-up appropriate for use withdiode sections and involving the utilization of all six of the terminalstrips previously described, the terminal strips adjacent the corners ofthe condenser assembly being marked A, B, C and D, and the intermediateterminal strips being marked E and F. Fig. 10 shows a hook-up sometimesused in both AM and PM circuits, in which the coils and the capacityunits are separately terminated. Fig. 11 shows an FM discriminatorhook-up involving the use of the five terminal strips A, B, C, D and F,the intermediate terminal strip E being idle in this instance. Fig. 12shows a modified FM hook-z up which also involves the use of five of theter-' minal strips, and is appropriate for use as a ratio detector. Theabove diagrams are illustrative of various capacity unit and coilcombinations and connections which may be readily obtained-by assembliesof the type above described.

While the invention has been disclosed as ems bodied in an assembly ofthe above described specific construction, it should be understood thatchanges may be made therein without de parting from the invention in itsbroader aspects, within the scope of the appended claims.

I claim:

1. A multi-unit condenser assembly of the character described includinga supporting block having rows of terminal strips disposed respectivelyadjacent opposite sides thereof, a plurality of insulating laminaeadjacent one face of said block having opposed sets of conducting filmconstituting a plurality of capacity units, said terminal strips havingcontact arms engaging films of said units, a central clamping memberextending through said block and laminae, at least one of said rowsincluding a. terminal strip located in the intermediate por-,- tion ofone of said first mentioned sides of said block, said last mentionedterminal strip having a contact arm oifset to extend partially aroundsaid clamping member into engagement with one of said conducting films.

2. A multi-unit condenser assembly of the character described includinga supporting block having rows of terminal strips disposed respectivelyadjacent opposite sides thereof, a plurality of insulating laminaeadjacent one face of said block having opposed sets of conducting filmconstituting a plurality of capacityunits, said terminal strips havingcontact arms engaging films of said units, a central clamping memberextending through said block and laminae, each of said rows including aterminal strip located in the intermediate portion of its respectiveside of said block, said last mentioned terminal strips each having acontact arm offset to extend partially around said clamping member intoengagement with one of said conducting films.

3. A multi-unit condenser assembly of the character described includinga supporting block having rows of terminal strips disposedrerespectively disposed near the corners of said block and otherterminal strips respectively located in the intermediate portions ofsaid first mentioned sides of said block, said last mentioned terminalstrips having said clamping member interposed between them, and each ofsaid last mentioned terminal strips having a contact arm off-set toextend partially-around said clamping member into engagement with one ofsaid conducting films.

JOSEPH R. MAZZOLA.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Name Date Ketcham Feb. 10, 1948 Number

